<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>

</head>
<body>

<h1>登录</h1>
<span>用户名</span>
<input type="text" id="username">
<span>密码</span>
<input type="password">
<button  id="login">登录</button>
</body>
<script src="lib/jquery-1.4.3.js"></script>
<script src="js/login.js"></script>
</html>